Truck cab



FIG. 1 is a perspective view of a truck cab showing my new design, it being understood that the broken lines are for illustrative purposes only and form no part of the claimed design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a side elevation view thereof, the opposite side being a mirror image of that shown;

FIG. 5 is a bottom plan view; and

FIG. 6 is a back elevational view thereof. 

The ornamental design for a truck cab, as shown and described. 